It was once believed_______ and thus we can tell

It was once believed_______,and thus we can tell how successful he/she will be in the fu-ture according to his/her intelligence.

A. born to be more intelligent or less intelligent

B. have a better chance to develop his intelligence

C.taught to be more intelligent

D.that intelligence was something a baby was born with

E. and because of the lack of communication with his classmates

F. and partly has to do with a child’s living environment